Method of manufacturing bolts.



E. l. DODDS. I METHOD OF MANUFACTURING BOLTS.

APPLICATION FILED JULY 9, I9

Patented Dec. 28, 1915.

WITNESSES To all whom it may concern: 2 l

Be it known that I, ETHAN I.' Donne,

Figure l is a sectional perspective view,

largely conventional, showing one form of heating furnace which I mayuse in carrying out my invention. Fig. 2 is a perspective view of one ofthe blanks used for making the bolt. Fig. 3 is a sectional view throughone form of bending die. Fig. 4 is a similar view of a compressing die.Fig. 5 is a sectional view of a heading die. Fig. 6 is a side elevationof one form of bolt made by my method; and Fig. 7 is a similar view ofanother form of bolt made by my method.

My invention has relation to a novel method of making bolts of variouscharacters, such as described and claimed in my co-pending applicationsSerial No. 759,915.

I filed April 9, 1913 and Serial No. 739,167,

filed April 9, 1913.

The first case discloses stay bolts having solid threaded end heads,which are connected to each other by two bar members and which aretwisted about each other throughout an angle of at least 180 degrees.

The track bolt shown in the latter application consists of a bodyportion composed of two separable bar members twisted upon each otherthrough an angle of less than 180 degrees and which is provided with athreaded portion. at one end and a flanged .head at the other end.

In making my improved bolts, I preferably proceed as follows: I take ablank, such as shown in Fig. 2, which may be formed of stay bolt iron orsteel, depending upon the purpose for which the bolt is to be used. Theblank is first placed above a female die, such as shown at 2, in Fig. 3,and is bent upon itself by means of a male member 3 which is moveddownwardly to bend the blank into the position shown at 4. The blank isthen placed between a plurality of die members 5 which are movedrelative to each other to squash the members in a transverse directionso that the flat face of one member is against the fiat faceSpecification of Letters Patent.

i ETI IAN I. n'onnsor CENTRA VALLEY,'NEW YORK, ASSIGNOR To KERNERMANUFAG TUBING corvrrnnmpr:PITTSBURGH,.rnnnsYL ANIA, Aconronnrron orPENN- SYLVANIA. l i

METHOD MANUFACTURING BOLTS.

Patented Dec. 28,1915.

Application filed uly9, 1913.. Serial 1 \l'o. 778",032.

of the other member. The blank or blanks are't-henplaced throughopenings 6. in a furnace 7 to heat the head portion thereof and afterthey have been heated to the proper temperature, they ,areplaced betweenhorizontally movable die members 8, suchas shown In Fig. 5, and arewelded and shaped by means of a plunger .9. After the bolt has beenheaded, the body of the bolt is twisted upon itself to the proper anglefor the specific bolt, and if the bolt is to be prov ded with a headandscrew threaded portlon, such as shown in Fig. 7 the end is threadedin any suitable manner.

If 1t is desired to form a bolt such as shown in Fig. 7, the heads areformed in suitably-shaped dies of a character such as shown in ig. 5,and the body of "the bolt may be twlsted after the formation of thefirst head and before the formation of the second head, or if desired,the body may be twisted after both heads have been upset and Welded. Ifdesired the blank may be placed 1n a lower position than that shown in F1g. 4, so as to completely close the space between the end of the head.

My nvention provides for the rapid,

economical and efficient manufacture of stay bolts of this character,and avoids the piling of the separate members in the openings of theheating furnace.

I am aware that it is old to form bolts of a plurality of members whichare piled and placed in the heating furnace to heat the ends beforeupsetting and welding, but in this method, it is very hard to retain theseveral members in proper position for the formation of the first head.By the use of my method, the several members from which the body portionis formed are fixedly held to each other throughout the heating andheading operations.

I claim:

1. The herein described method of manufacturing bolts, which consists inbending a blank upon itself, then further bending the blank ina-transverse direction to bring the fiat face of one member of the blankinto engagement with the fiat face of the other member of the blank,then heating the bent end of the blank, and then forming the head byupsetting said end and simultaneously welding the adjacent faces to eachother at the upset portion; substantially as described.

2. The herein described method of manufacturing bolts, which consists inbending a blank upon itself, then further bending the blankin a:transverse direction to bring the flat-face of one member of theblankintouenm gagement with the flat face of the other member of the blank,then heating thebent end of the blank, then forming the head byupsetting said; end and simultaneously Weld ing the adjacent faces to,each other, at the upset portion, then twisting the body of the bo t,andi henns ap g e, other end to e.-

Qe 've a, onnecting member; substantially as de cr b d;

he herein esc b dmethod. ofim nur a r ng, ts, hich nsis s. ending. a, blnk upon. tse f, hen. further. bending-the. blan in. a. ran v r di ecitmtto. ring, he

Copies of this patent; may be obtained for fiat f'ace of'one member'oft'he blank into en gagement With the flat face of the othermemben-of-F'the blank, then: heating the-bent end ofit'he-blank, thenformingthe: head by] upsetting said end and simultaneouslytwelding: theadjacent faces to each other'at the upset portion, and then forming ahead on thewther end of the bolt and screw'thre ad ing bothof saidheads; substantially as defive-cents each, b3; addressing-the G'qmmissionermfiTatents, Washington, D, G:- 1

